Both the double- and triple-head Harvey DLX stethoscopes are specifically designed to accentuate important sounds and enable you to hear cardiac pulmonary and vascular sounds without relying on difficult variable-pressure techniques *the Harvey DLX is equipped with dual-bore tubing that creates two uninterrupted sound channels and works with the optimally weighted brass chestpieces to transmit a full range of physical sounds *Providing clear crisp sound the Harvey DLX helps enhance your auscultation capabilities *New longer 28 length full-range cardiology/pulmonary stethoscope *available with double-head brass bell and flat diaphragm) or rotatable *triple-head (brass bell and corrugated diaphragm) chestpieces *Pediatric chestpieces available *Chrome-plated brass chestpieces and binaurals *Rotatable binaurals and interchangeable comfort sealing ear tips Triple-leaf binaural spring encased in polyurethane allows size djustment while preventing breakage *Latex-free *Dual lumen Harvey DLX Triple Head Black (28 )